Allow the user to specify a different
Filter out @usernames, #hashtags, and URLs
Reject tweets if they match source text at all
Add a little more documentation
Make the check that the Markov is not repeating existing sentence look at just letters (not punctuation)
Merge remote-tracking branch 'harrisj/master'

Conflicts:
	README.md
	ebook.rb
Don't simply "rescue" after getting tweets; this makes debugging easier